how to set the background as transparent?
 

I'm trying to render a raster swf with swift 3d lightwave... whenever I render there is a solid black background. Swift 3d will automatically crop if the background is set to transparent. Can someone tell me how I could make the background transparent?

I've tried to search the internet, and work with the settings for a couple of hours to no avail. Thanks!

nevermind
 

I figured it out, lightwave renders transparent as black, but when opened in flash it's transparent.